{
  "manageEntity": {
    "action": "Save",
    "entityId": "659742809",
    "entityType": "Track",
    "nonce": "0x3687c062ae7dfefad1c8839243496c3c1dea7b5113b4c71541cb8aa865215341",
    "signature": "0x218f86d832103280df24c1d782e5bb0cb93cfecb48ba189484ec14001a6100220846cc1140e1e793e811bf38ce1a5eec86d01996e99d9e8fedf8d42d8aafc6741b",
    "signer": "0x742Fff9be20F80Ce7285c8Ab12B9018Ef3Cf14F0",
    "userId": "111467392"
  }
}